4 EMF Shielding Techniques For 2019

When the exposure to electromagnetic fields exceeds the values ​​triggering the action, different preventive actions must be implemented.

When the exposure to the workstation is lower than the Values ​​triggering the Action (VA), it is necessary to ensure rigorous maintenance of the installations (covers, screen shields, closure screw, connection to the ground ...). The intensities of the electromagnetic fields must be checked at each modification of the workstation (equipment, procedure, process, etc.) and after each maintenance operation that may influence the exposure.

If the VA is exceeded, the employer must put in place technical and organizational preventive measures to reduce the exposure of the fields.

Source reduction:

To reduce the intensity of electromagnetic fields at the source, it is possible to:

modify the equipment in agreement with their designers (integrated shielding),

reduce the power of the program or temporarily interrupt the program,

isolate a work area (shielding a room).

The equipment must be kept in good condition (cleaning of joints, changing of doors and hoods, verification of their effectiveness ...).

Screening of the shielding fabric. The larger sizes of square worst shielding will be the ' attenuation of' electrosmog high frequency and reduced the protection against electrosmog. The shielding yarns, on a cotton or polyester base, incorporate a single metal wire or a multifilament of shielding alloy. The number of threads per centimeter and the distance between the wires determines the mitigation properties from radio frequency microwaves. As an example, a shielding fabric with squares of 0.55 mm with 18 threads per centimeter will give greater electromagnetic shielding with respect to one by 5 mm with 2 threads/cm.

Reduction of exposure by distance

The electromagnetic fields decrease rapidly with the distance: the distance from a few tens of centimeters to a few meters (depending on the frequency) of the operator with respect to the source, when possible, is simple and effective protection.

Duration of exposure

For frequencies below 10 MHz, since the electrical stimulation effects of the nervous system are instantaneous, reducing the duration of exposure is not a preventative solution.

For exposures to frequencies above 100 kHz, the actual duration of exposure per 6-minute period should be taken into account (because it is on this basis that the "whole body" VAs are frequencies).

Working environment

Work environments where the static field is intense must be signposted with the appropriate pictogram and information alerting to the prohibition of penetration with ferromagnetic objects must appear as soon as access to the area is reached.

In environments where high-frequency fields are very intense, conductive objects are likely to heat up strongly. As a result, worn items such as rings, watches, belt buckles must be removed.

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